Epson DFX-8500 Service Manual page 80

DFX-8500
Table 2-7 lists the CR motor drive modes.
Division
Carriage moves Super Draft
with printing. Super Draft HD
Note 2) Draft
Draft HD
Bit image 1
Bit image 2
Bit image 3
NLQ
NLQ HD
Super Draft X 1/3
Bit image 4
Draft X 1/3
Bit image 1 X 1/3
Bit image 2 X 1/3
Bit image 3 X 1/3
NLQ X 1/3
Draft X 1/6
Bit image 4 X 1/3
Bit image 3 X 1/6
Carriage moves Home
without printing seek
Note 3) Paper
detection seek
Logical seek 0
Logical seek 1
Logical seek 2
Measurement seek
Notes 1: Refer to Table 2-8.
Notes 2: This division applies to all printing modes. PI control oversees the constant speed. (Refer
to page 2-27 for more information on PI control.) For increased throughput, the division
Super Draft to Draft HD allows printing during acceleration and deceleration.
Notes 3: This division increases throughput when the carriage is moving and the printer is not
printing.
The printer has three deceleration control modes. The degree of deceleration is determined by how the CR
motor transistors are driven. Table 2-8 describes how the transistors are driven for each mode.
Carriage Transfer Direction
Left -> Right
Right -> Left
2-26
Table 2-7. CR Motor Drive Modes
Drive Mode CR Motor Speed
position
width
Table 2-8. CR Motor Drive Sequence
Driving Mode
Acceleration
Deceleration 1
Deceleration 2
Deceleration 3
Acceleration
Deceleration 1
Deceleration 2
Deceleration 3
Acceleration /
(rpm) Deceleration Control
2800 Acceleration and
2666 Deceleration 1
2100
2000
1050 Acceleration and
1050 Deceleration 3
1050
1050
1000
888
933
666
555
500
444
333
333
277
222
500
500
2100
1050
333
-
Driver (Refer to Figure 2-19.)
Q1 Q2
ON
ON ON
ON ON
ON
Constant
Speed
Curve Control
Note1)
PI control
Q3 Q4
ON ON
ON
ON
ON ON
Rev. B